conf.c

< linux网络编程工具>>配套源码

		dequote_map, null_map_store);

#ifdef MAP_REGEX
	MAPDEF("regex", NULL, 0,
		regex_map_init, null_map_open, null_map_close,
		regex_map_lookup, null_map_store);
#endif /* MAP_REGEX */

#if USERDB
	/* user database */
	MAPDEF("userdb", ".db", 0,
		map_parseargs, null_map_open, null_map_close,
		udb_map_lookup, null_map_store);
#endif /* USERDB */

	/* arbitrary programs */
	MAPDEF("program", NULL, MCF_ALIASOK,
		map_parseargs, null_map_open, null_map_close,
		prog_map_lookup, null_map_store);

	/* sequenced maps */
	MAPDEF("sequence", NULL, MCF_ALIASOK,
		seq_map_parse, null_map_open, null_map_close,
		seq_map_lookup, seq_map_store);

	/* switched interface to sequenced maps */
	MAPDEF("switch", NULL, MCF_ALIASOK,
		map_parseargs, switch_map_open, null_map_close,
		seq_map_lookup, seq_map_store);

	/* null map lookup -- really for internal use only */
	MAPDEF("null", NULL, MCF_ALIASOK|MCF_OPTFILE,
		map_parseargs, null_map_open, null_map_close,
		null_map_lookup, null_map_store);

	/* syslog map -- logs information to syslog */
	MAPDEF("syslog", NULL, 0,
		syslog_map_parseargs, null_map_open, null_map_close,
		syslog_map_lookup, null_map_store);

	/* macro storage map -- rulesets can set macros */
	MAPDEF("macro", NULL, 0,
		dequote_init, null_map_open, null_map_close,
		macro_map_lookup, null_map_store);

	/* arithmetic map -- add/subtract/compare */
	MAPDEF("arith", NULL, 0,
		dequote_init, null_map_open, null_map_close,
		arith_map_lookup, null_map_store);

	if (tTd(38, 2))
	{
		/* bogus map -- always return tempfail */
		MAPDEF("bogus",	NULL, MCF_ALIASOK|MCF_OPTFILE,
		       map_parseargs, null_map_open, null_map_close,
		       bogus_map_lookup, null_map_store);
	}
}

#undef MAPDEF
/*
**  INITHOSTMAPS -- initial host-dependent maps
**
**	This should act as an interface to any local service switch
**	provided by the host operating system.
**
**	Parameters:
**		none
**
**	Returns:
**		none
**
**	Side Effects:
**		Should define maps "host" and "users" as necessary
**		for this OS.  If they are not defined, they will get
**		a default value later.  It should check to make sure
**		they are not defined first, since it's possible that
**		the config file has provided an override.
*/

void
inithostmaps()
{
	register int i;
	int nmaps;
	char *maptype[MAXMAPSTACK];
	short mapreturn[MAXMAPACTIONS];
	char buf[MAXLINE];

	/*
	**  Set up default hosts maps.
	*/

#if 0
	nmaps = switch_map_find("hosts", maptype, mapreturn);
	for (i = 0; i < nmaps; i++)
	{
		if (strcmp(maptype[i], "files") == 0 &&
		    stab("hosts.files", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "hosts.files text -k 0 -v 1 /etc/hosts",
				sizeof buf);
			(void) makemapentry(buf);
		}
# if NAMED_BIND
		else if (strcmp(maptype[i], "dns") == 0 &&
		    stab("hosts.dns", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "hosts.dns dns A", sizeof buf);
			(void) makemapentry(buf);
		}
# endif /* NAMED_BIND */
# ifdef NISPLUS
		else if (strcmp(maptype[i], "nisplus") == 0 &&
		    stab("hosts.nisplus", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "hosts.nisplus nisplus -k name -v address hosts.org_dir",
				sizeof buf);
			(void) makemapentry(buf);
		}
# endif /* NISPLUS */
# ifdef NIS
		else if (strcmp(maptype[i], "nis") == 0 &&
		    stab("hosts.nis", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "hosts.nis nis -k 0 -v 1 hosts.byname",
				sizeof buf);
			(void) makemapentry(buf);
		}
# endif /* NIS */
# if NETINFO
		else if (strcmp(maptype[i], "netinfo") == 0) &&
		    stab("hosts.netinfo", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "hosts.netinfo netinfo -v name /machines",
				sizeof buf);
			(void) makemapentry(buf);
		}
# endif /* NETINFO */
	}
#endif /* 0 */

	/*
	**  Make sure we have a host map.
	*/

	if (stab("host", ST_MAP, ST_FIND) == NULL)
	{
		/* user didn't initialize: set up host map */
		(void) strlcpy(buf, "host host", sizeof buf);
#if NAMED_BIND
		if (ConfigLevel >= 2)
			(void) strlcat(buf, " -a. -D", sizeof buf);
#endif /* NAMED_BIND */
		(void) makemapentry(buf);
	}

	/*
	**  Set up default aliases maps
	*/

	nmaps = switch_map_find("aliases", maptype, mapreturn);
	for (i = 0; i < nmaps; i++)
	{
		if (strcmp(maptype[i], "files") == 0 &&
		    stab("aliases.files", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "aliases.files null", sizeof buf);
			(void) makemapentry(buf);
		}
#ifdef NISPLUS
		else if (strcmp(maptype[i], "nisplus") == 0 &&
		    stab("aliases.nisplus", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "aliases.nisplus nisplus -kalias -vexpansion mail_aliases.org_dir",
				sizeof buf);
			(void) makemapentry(buf);
		}
#endif /* NISPLUS */
#ifdef NIS
		else if (strcmp(maptype[i], "nis") == 0 &&
		    stab("aliases.nis", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "aliases.nis nis mail.aliases",
				sizeof buf);
			(void) makemapentry(buf);
		}
#endif /* NIS */
#if NETINFO
		else if (strcmp(maptype[i], "netinfo") == 0 &&
		    stab("aliases.netinfo", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "aliases.netinfo netinfo -z, /aliases",
				sizeof buf);
			(void) makemapentry(buf);
		}
#endif /* NETINFO */
#ifdef HESIOD
		else if (strcmp(maptype[i], "hesiod") == 0 &&
		    stab("aliases.hesiod", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "aliases.hesiod hesiod aliases",
				sizeof buf);
			(void) makemapentry(buf);
		}
#endif /* HESIOD */
	}
	if (stab("aliases", ST_MAP, ST_FIND) == NULL)
	{
		(void) strlcpy(buf, "aliases switch aliases", sizeof buf);
		(void) makemapentry(buf);
	}

#if 0		/* "user" map class is a better choice */
	/*
	**  Set up default users maps.
	*/

	nmaps = switch_map_find("passwd", maptype, mapreturn);
	for (i = 0; i < nmaps; i++)
	{
		if (strcmp(maptype[i], "files") == 0 &&
		    stab("users.files", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "users.files text -m -z: -k0 -v6 /etc/passwd",
				sizeof buf);
			(void) makemapentry(buf);
		}
# ifdef NISPLUS
		else if (strcmp(maptype[i], "nisplus") == 0 &&
		    stab("users.nisplus", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "users.nisplus nisplus -m -kname -vhome passwd.org_dir",
				sizeof buf);
			(void) makemapentry(buf);
		}
# endif /* NISPLUS */
# ifdef NIS
		else if (strcmp(maptype[i], "nis") == 0 &&
		    stab("users.nis", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "users.nis nis -m passwd.byname",
				sizeof buf);
			(void) makemapentry(buf);
		}
# endif /* NIS */
# ifdef HESIOD
		else if (strcmp(maptype[i], "hesiod") == 0) &&
		    stab("users.hesiod", ST_MAP, ST_FIND) == NULL)
		{
			(void) strlcpy(buf, "users.hesiod hesiod", sizeof buf);
			(void) makemapentry(buf);
		}
# endif /* HESIOD */
	}
	if (stab("users", ST_MAP, ST_FIND) == NULL)
	{
		(void) strlcpy(buf, "users switch -m passwd", sizeof buf);
		(void) makemapentry(buf);
	}
#endif /* 0 */
}
/*
**  SWITCH_MAP_FIND -- find the list of types associated with a map
**
**	This is the system-dependent interface to the service switch.
**
**	Parameters:
**		service -- the name of the service of interest.
**		maptype -- an out-array of strings containing the types
**			of access to use for this service.  There can
**			be at most MAXMAPSTACK types for a single service.
**		mapreturn -- an out-array of return information bitmaps
**			for the map.
**
**	Returns:
**		The number of map types filled in, or -1 for failure.
**
**	Side effects:
**		Preserves errno so nothing in the routine clobbers it.
*/

#if defined(SOLARIS) || (defined(sony_news) && defined(__svr4))
# define _USE_SUN_NSSWITCH_
#endif /* defined(SOLARIS) || (defined(sony_news) && defined(__svr4)) */

#ifdef _USE_SUN_NSSWITCH_
# include <nsswitch.h>
#endif /* _USE_SUN_NSSWITCH_ */

#if defined(ultrix) || (defined(__osf__) && defined(__alpha))
# define _USE_DEC_SVC_CONF_
#endif /* defined(ultrix) || (defined(__osf__) && defined(__alpha)) */

#ifdef _USE_DEC_SVC_CONF_
# include <sys/svcinfo.h>
#endif /* _USE_DEC_SVC_CONF_ */

int
switch_map_find(service, maptype, mapreturn)
	char *service;
	char *maptype[MAXMAPSTACK];
	short mapreturn[MAXMAPACTIONS];
{
	int svcno;
	int save_errno = errno;

#ifdef _USE_SUN_NSSWITCH_
	struct __nsw_switchconfig *nsw_conf;
	enum __nsw_parse_err pserr;
	struct __nsw_lookup *lk;
	static struct __nsw_lookup lkp0 =
		{ "files", {1, 0, 0, 0}, NULL, NULL };
	static struct __nsw_switchconfig lkp_default =
		{ 0, "sendmail", 3, &lkp0 };

	for (svcno = 0; svcno < MAXMAPACTIONS; svcno++)
		mapreturn[svcno] = 0;

	if ((nsw_conf = __nsw_getconfig(service, &pserr)) == NULL)
		lk = lkp_default.lookups;
	else
		lk = nsw_conf->lookups;
	svcno = 0;
	while (lk != NULL)
	{
		maptype[svcno] = lk->service_name;
		if (lk->actions[__NSW_NOTFOUND] == __NSW_RETURN)
			mapreturn[MA_NOTFOUND] |= 1 << svcno;
		if (lk->actions[__NSW_TRYAGAIN] == __NSW_RETURN)
			mapreturn[MA_TRYAGAIN] |= 1 << svcno;
		if (lk->actions[__NSW_UNAVAIL] == __NSW_RETURN)
			mapreturn[MA_TRYAGAIN] |= 1 << svcno;
		svcno++;
		lk = lk->next;
	}
	errno = save_errno;
	return svcno;
#endif /* _USE_SUN_NSSWITCH_ */

#ifdef _USE_DEC_SVC_CONF_
	struct svcinfo *svcinfo;
	int svc;

	for (svcno = 0; svcno < MAXMAPACTIONS; svcno++)
		mapreturn[svcno] = 0;

	svcinfo = getsvc();
	if (svcinfo == NULL)
		goto punt;
	if (strcmp(service, "hosts") == 0)
		svc = SVC_HOSTS;
	else if (strcmp(service, "aliases") == 0)
		svc = SVC_ALIASES;
	else if (strcmp(service, "passwd") == 0)
		svc = SVC_PASSWD;
	else
	{
		errno = save_errno;
		return -1;
	}
	for (svcno = 0; svcno < SVC_PATHSIZE; svcno++)
	{
		switch (svcinfo->svcpath[svc][svcno])
		{
		  case SVC_LOCAL:
			maptype[svcno] = "files";
			break;

		  case SVC_YP:
			maptype[svcno] = "nis";
			break;

		  case SVC_BIND:
			maptype[svcno] = "dns";
			break;

# ifdef SVC_HESIOD
		  case SVC_HESIOD:
			maptype[svcno] = "hesiod";
			break;
# endif /* SVC_HESIOD */

		  case SVC_LAST:
			errno = save_errno;
			return svcno;
		}
	}
	errno = save_errno;
	return svcno;
#endif /* _USE_DEC_SVC_CONF_ */

#if !defined(_USE_SUN_NSSWITCH_) && !defined(_USE_DEC_SVC_CONF_)
	/*
	**  Fall-back mechanism.
	*/

	STAB *st;
	time_t now = curtime();

	for (svcno = 0; svcno < MAXMAPACTIONS; svcno++)
		mapreturn[svcno] = 0;

	if ((now - ServiceCacheTime) > (time_t) ServiceCacheMaxAge)
	{
		/* (re)read service switch */
		register FILE *fp;
		long sff = SFF_REGONLY|SFF_OPENASROOT|SFF_NOLOCK;

		if (!bitnset(DBS_LINKEDSERVICESWITCHFILEINWRITABLEDIR,
			    DontBlameSendmail))
			sff |= SFF_NOWLINK;

		if (ConfigFileRead)
			ServiceCacheTime = now;
		fp = safefopen(ServiceSwitchFile, O_RDONLY, 0, sff);
		if (fp != NULL)
		{
			char buf[MAXLINE];

			while (fgets(buf, sizeof buf, fp) != NULL)
			{
				register char *p;

				p = strpbrk(buf, "#\n");
				if (p != NULL)
					*p = '\0';
				p = strpbrk(buf, " \t");
				if (p != NULL)
					*p++ = '\0';
				if (buf[0] == '\0')
					continue;
				if (p == NULL)
				{
					sm_syslog(LOG_ERR, NOQID,
						  "Bad line on %.100s: %.100s",
						  ServiceSwitchFile,
						  buf);
					continue;
				}
				while (isspace(*p))
					p++;
				if (*p == '\0')
					continue;

				/*
				**  Find/allocate space for this service entry.
				**	Space for all of the service strings
				**	are allocated at once.  This means
				**	that we only have to free the first
				**	one to free all of them.
				*/

				st = stab(buf, ST_SERVICE, ST_ENTER);
				if (st->s_service[0] != NULL)
					free((void *) st->s_service[0]);
				p = newstr(p);
				for (svcno = 0; svcno < MAXMAPSTACK; )
				{
					if (*p == '\0')
						break;
					st->s_service[svcno++] = p;
					p = strpbrk(p, " \t");
					if (p == NULL)
						break;
					*p++ = '\0';
					while (isspace(*p))
						p++;
				}
				if (svcno < MAXMAPSTACK)
					st->s_service[svcno] = NULL;
			}
			(void) fclose(fp);
		}
	}

	/* look up entry in cache */
	st = stab(service, ST_SERVICE, ST_FIND);
	if (st != NULL && st->s_service[0] != NULL)
	{
		/* extract data */
		svcno = 0;
		while (svcno < MAXMAPSTACK)
		{
			maptype[svcno] = st->s_service[svcno];
			if (maptype[svcno++] == NULL)
				break;
		}
		errno = save_errno;
		return --svcno;
	}
#endif /* !defined(_USE_SUN_NSSWITCH_) && !defined(_USE_DEC_SVC_CONF_) */

#if !defined(_USE_SUN_NSSWITCH_)
	/* if the service file doesn't work, use an absolute fallback */
# ifdef _USE_DEC_SVC_CONF_
  punt:
# endif /* _USE_DEC_SVC_CONF_ */
	for (svcno = 0; svcno < MAXMAPACTIONS; svcno++)
		mapreturn[svcno] = 0;
	svcno = 0;
	if (strcmp(service, "aliases") == 0)
	{
		maptype[svcno++] = "files";
# if defined(AUTO_NETINFO_ALIASES) && defined (NETINFO)
		maptype[svcno++] = "netinfo";
# endif /* defined(AUTO_NETINFO_ALIASES) && defined (NETINFO) */
# ifdef AUTO_NIS_ALIASES
#  ifdef NISPLUS
		maptype[svcno++] = "nisplus";
#  endif /* NISPLUS */
#  ifdef NIS
		maptype[svcno++] = "nis";
#  endif /* NIS */
# endif /* AUTO_NIS_ALIASES */
		errno = save_errno;
		return svcno;
	}
	if (strcmp(service, "hosts") == 0)
	{
# if NAMED_BIND
		maptype[svcno++] = "dns";
# else /* NAMED_BIND */